Mar jacobsen



=aijull, clear. and exact description of the in- ..vention, such as will enable others'skilled in.

UNITED STATES PATENT OFFICE. .j

ms HENBIK HJ'ALMAR J'ACOB SEN, HERLOEV, DENMARK.

01 MNUFAGTURING RADIO-ACTIVE 1MINEIHAIL-J'VA'II'IEIR SALTS.

lo Drawing.

To all whom it may concern:

Beit known that I, JENS HENRIK HJAL- MAR JAooBsEN, pharmacist, a citizen of the Kingdom of Denmark, and resident of Herloev, in the Kingdom of Denmark, (Whose post-oilice address is Herloev, Denmark) have=invented certain newand useful Improvements in Methods of Manufactur- Radio Active J- Mineral Water Salts; and I do hereby declare the following to be -he art to which it appertains to make and use the same. I/

The .natural mineral-water salts on the market which are derived from springs are not radio-active, because the radio-activity,

which is due to' emanation from insoluble radium compounds in the interior of the earth, disa pearsby the process of evaporation, and 81cm is. some difficulty connected with imparting radio-activity to these salts in such a mannelgthat. they will retain this property permanently and constantly. This also applies to'theartificial mineral-Water salts. In order that the radio-activity may be permanent, it is necessary that the salt contains compounds of radio-active metals (radium, actinium, etc.) but as therelat'ive quantity'of these metals is infinitely small, they must not only be comminuted exceedingly fine and thoroughly distributed, but this distribution must be extremely even, for

otherwise great portions of the salt mixture,

treated will be absolutely free from the radio-active substance while other portions -will be too rich in this substance This exceedingly fine comminution and even distribution of the radio-active substance throughout the salt is counteracted by its content of radium-precipitating acid (sulfuric acid).

. According to this invention, artificial mineral-water salts are imparted a permanent and evenly distributed radio-activity in the following manner, to wit: The radio-- active substance either pure or in mixture with one or more of-the ingredlents of the mineral-water salt, is subjected to a very through mechanical mixing or comminution process together with the mineral-water salt or certain of its ingredients, said mixture or Specification o! Letters Patent.

Patented Jam 15, 1918-.

Application filed my a, 1915. serial No. 26,765.

oomminuting being accomplished by means of suitable mixing-apparatus and eventually in several stages, with-the exclusion of all dampness. .No matter whether .the radioactive substance is present as a soluble or as an insoluble compound, it will be distributed "throughoutthis salt by means of this treat- Inent-with extreme evenness, so that every little particle of it shows-the presence of. the quantity of radio-activity determined by the dosing of the radio-active substance (measured in millicuries or Mache-units').

Ezample A certain quantity of radio-active substance, for instance .radium bromid, is dissolved in a certain solution of the ingredient or ingredients of the mineral-water salt not containing radium-precipitating acids- The solution is evaporated to dryness, and the dry salt is subjected to the aforesaid mixingprocess together with the other ingredients of the mineral-water salt. None of these should contain water of crystallization, and the salt should be kept in a dry place.

I claim I 1. The method of producing soluble radioactive medicinal salts, which comprises forming a solution of a radium salt and another salt which does not precipitate radium, and evaporating to dryness, ,said salts being free from 'Water of crystallization. a

.2. The method of producing permanen soluble radio-active medicinal salts of mineral Waters, which comprises 'forming an aqueous solution of a radium salt and a salt of the mineral water that does not precipitate radium, eva crating to dryness, the resulting product. eing freed from water of crystallization, pulverizing the salt with the other salt constituents of the mineral water, and keeping the mixture dry,

In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses. JENS HENRIK HJALMAR JACOBSEN.

' Witnesses:

L. HOFMAN BANZ, ERNEST BOUTARD. 

